Cylinder block for liquid-cooled internal combustion engines with inserted cylinder liner

ABSTRACT

A cylinder block for liquid-cooled internal combustion engines which has an inserted cylinder liner whereby a possibly multiple grooving for the guidance of the cooling liquid is arranged in spiral shape between the outer surface of the cylinder liner and the inner surface of the cylinder block receiving the same; the grooving extends preferably with a relatively small pitch from an inlet to an outlet and extends either over the entire height of the cylinder liner or over only a part thereof.

United States Patent Mirjanic [54] CYLINDER BLOCK FOR LIQUID- COOLED INTERNAL COMBUSTION ENGINES WITH INSERTED CYLINDER LINER [72] Inventor: Milorad Mlrjanic, 1m Vogelsang, Germany [73] Assignee: Daimler-Benz Aktiengesellschaft,, Ger- ]fiaiw 1 [22] Filed: March 26, 1970 21 Appl. No.: 22,837

[30] Foreign Application Priority Date March 28, 1968 Germany ..P 19 16 096.4

[52] US. Cl ..92/l44,, 123/4l.8

51 Int.Cl.... ..F0lb31/08 5s FieldfofSearch ..l23/4l.8,193.6;92/l44 [56] References Cited UNITED STATES PATENTS 843,068 2/1907 Brady .3. ..123/41.s

14 1 June 27, 1972 1,347,480 7/1920 Jefiries ..123/41.s 2,417,448 3/1947 Rouy 3,086,505 4/1963 Bouard ..123/41.s

FOREIGN PATENTS OR APPLlCATlONS 578,437 6/1946 Great Britain ..123/41.s 804,502 4/1951 Germany 601,894 10/1945 Great Britain 123/41 .8

Primary Examiner-Martin P. Schwadron Assistant Examiner-Ronald H. Lazarus Attorney-Craig, Antonelli & Hill [57] ABSTRACT A cylinder block for liquid-cooled internal combustion engines which has an inserted cylinder liner whereby a possibly multiple grooving for the guidance of the cooling liquid is arranged in spiral shape between the outer surface of the cylinder liner and the inner surface of the cylinder block receiving the same; the grooving extends preferably with a relatively small pitch from an inlet to an outlet and extends either over the entire height of the cylinder liner or over only a part thereof.

7 Claims, 3 Drawing Figures PATENTEDJuue? m2 3,672,263

FIGJ

INVENTOR MILORAD MIRJANIC MVM ATTORNEYS CYLINDER BLOCK FOR LIQUID-COOLED INTERNAL COMBUSTION ENGINES WITII INSER'IED CYLINDER LINER The present invention relates to a cylinder block for liquidcooled internal combustion engines with inserted cylinder liner.

The present invention is based on the aim to provide a good cooling for a cylinder block with smallest possible structural expenditure.

This is achieved according to the present invention in that a groove, possibly a multiple groove for the guidance and conduction of the cooling liquid is arranged spirally shaped, preferably winding with a small pitch from an inlet to an outlet, at the outer surface of the cylinder liner or at the inner surface of the mounting body of the cylinder liner, and in that the grooving is delimited externally by the mounting body of the cylinder liner or internally by the cylinder liner itself.

The main advantage of this cooling medium flow is a very good heat removal as a result of a longer, appropriately extending path of the cooling medium about the cylinder wall. The possibility exists with this arrangement of the cylinder wall cooling to conduct the liquid of the cylinder head cooling system in parallel with that of the cylinder block so that both engine parts receive cooling liquid with lowest possible temperature.

In a preferred type of construction of the present invention, cooling liquid spaces possibly separated from one another by a separating or partition wall may be arranged in the mounting body which are in communication with the inlet and the outlet of the grooving. An additional reinforcement of the crankcase in the transverse plane is achieved by the separating or partition wall. In this construction, the fastening of the cylinder head is not impaired by the cooling system since the bolt eyes are disposed outside of the cooling medium. A cylinder warping or a warping of the cylinder liners can be reduced to a minimum by the optimum design of the cooling system in accordance with the present invention.

According to a further feature of the present invention, the inlet and outlet may terminate in the grooving tangentially to the circumference of the cylinder liner.

Furthermore, it is proposed according to the present invention that the grooving commences at the upper edge of the cylinder liner andthat the grooving winds about the cylinder liner either entirely or only in part over its entire height.

Accordingly, it is an object of the present invention to provide a cylinder block for liquid-cooled internal combustion engines with inserted cylinder liner which obviates by simple means the aforementioned shortcomings and drawbacks encountered in the prior art.

Another object of the present invention resides in a cylinder block for liquid-cooled internal combustion engines which enables an optimum cooling with minimum structural expenditures.

A further object of the present invention resides in a cylinder block construction for liquid-cooled internal combustion engines with inserted cylinder liners which favors the removal of heat while permitting the use of separate cooling liquid conductions for the cylinder block and the cylinder head cooling systems.

A still further object of the present invention resides in a cylinder block construction for liquid-cooled internal combustion engines of the type described above which brings about a reinforcement of the crankcase in the transverse plane while facilitating the fixing of the cylinder head onto the cylinder block without disturbing the cooling systems.

These and further objects, features and advantages of the present invention will become more obvious from the follow ing description when taken in connection with the accompanying drawing which shows, for purposes of illustration only, two embodiment in accordance with the present invention, and wherein:

FIG. I is a partial longitudinal cross-sectional view through a cylinder block with inserted cylinder liner in accordance with the present invention;

FIG. 1A is a partial longitudinal cross-sectional view similar to the upper portion of FIG. 1, except for the modified multiple groove structure; and

FIG. 2 is a partial top cross-sectional view taken along the line II-II of FIG. 1.

Referring now to FIG. 1 of the drawing, reference numeral 1 designates therein the mounting body, i.e., cylinder block which contains two cooling liquid spaces 3 and 4 separated from one another by a partition wall 2. A cylinder liner 5 is inserted into the cylinder block or mounting body 1 in a conventional manner. At its outer surface 6 the cylinder liner 5 is provided with a spirally-shaped groove 7 for conducting the cooling liquid.

The cooling liquid flows from the cooling liquid space 3 by way of an inlet 8 at the upper edge of the cooling liquid space 3 into the groove 7, flows through the same, and flows out of the groove 7 through an outlet 9 within the area of the lower edge of the cooling liquid space 4.

According to the present invention, instead of the grooving 7, a multiple grooving system in the manner of a multiple thread may be provided whereby all groove inlets and outlets are combined into a respective common inlet and common outlet, respectively. FIG. 1A shows an arrangement utilizing such multiple grooves 7'.

While I have shown and described only two embodiments in accordance with the present invention, it is understood that the same is not limited thereto but is susceptible of numerous changes and modifications as known to those skilled in the art and I therefore do not wish to be limited to the details shown and described herein but intend to cover all such changes and modifications as are encompassed by the scope of the appended claims.

I Claim:

1. A cylinder block arrangement for liquid-cooled internal combustion engines comprising a cylinder liner inserted into a cylinder mounting body forming part of the cylinder block, spiral groove means being formed in effect between the cylinder liner and the mounting body, said groove means being defined by said mounting body and said cylinder liner, said mounting body being provided with upper and lower cooling liquid spaces formed by substantially parallel wall portions of the cylinder block subdivided into the upper and lower cooling liquid spaces by a common cross wall forming a reinforcing web portion extending essentially transversely to the cylinder axis about midway of the length of the axial extent of the spiral groove means, the length of the wall portions defining the spaces being substantially coextensive with the axial extent of the spiral groove means, the upper cooling liquid space being closed off in the area of the upper end of the spiral groove means by a cross wall and the lower cooling liquid space being closed off within the area of the lower end of the spiral groove means by a further cross wall, inlet means within the upper area of the upper cooling liquid space providing an inlet for the cooling liquid with the upper end of the spiral groove means, and outlet means within the lower area of the cooling liquid space providing an outlet for the cooling liquid at the lower end of the spiral groove means so that the cooling liquid flows from the upper cooling liquid space into the upper end of the spiral groove means, then passes through the spiral groove means and flows out at the lower end thereof by way of the outlet means into the lower cooling liquid space.

2. An arrangement according to claim 1, characterized in that said spiral groove means is arranged with a relatively small pitch winding from an inlet to an outlet.

3. An arrangement according to claim 2, characterized in that a multiple groove means is provided for the guidance of the cooling liquid.

4. An arrangement according to claim 1, characterized in that said groove means is arranged at the outer surface of the cylinder liner and is delimited externally by the mounting body.

5. An arrangement according to claim 1, characterized in that the groove means begins at the upper edge of the cylinder liner and winds about the cylinder liner at least over a part of its entire height.

6. An arrangement according to claim 1, characterized in that said inlet means terminates in said groove means substantially tangentially to the circumference of the cylinder liner.

7. An arrangement according to claim 6, characterized in that said outlet means terminates in said groove means sub- 5 stantially tangentially to the circumference of the cylinder liner. 

1. A cylinder block arrangement for liquid-cooled internal combustion engines comprising a cylinder liner inserted into a cylinder mounting body forming part of the cylinder block, spiral groove means being formed in effect between the cylinder liner and the mounting body, said groove means being defined by said mounting body and said cylinder liner, said mounting body being provided with upper and lower cooling liquid spaces formed by substantially parallel wall portions of the cylinder block subdivided into the upper and lower cooling liquid spaces by a common cross wall forming a reinforcing web portion extending essentially transversely to the cylinder axis about midway of the length of the axial extent of the spiral groove means, the length of the wall portions defining the spaces being substantially coextensive with the axial extent of the spiral groove means, the upper cooling liquid space being closed off in the area of the upper end of the spiral groove means by a cross wall and the lower cooling liquid space being closed off within the area of the lower end of the spiral groove means by a further cross wall, inleT means within the upper area of the upper cooling liquid space providing an inlet for the cooling liquid with the upper end of the spiral groove means, and outlet means within the lower area of the cooling liquid space providing an outlet for the cooling liquid at the lower end of the spiral groove means so that the cooling liquid flows from the upper cooling liquid space into the upper end of the spiral groove means, then passes through the spiral groove means and flows out at the lower end thereof by way of the outlet means into the lower cooling liquid space.
 2. An arrangement according to claim 1, characterized in that said spiral groove means is arranged with a relatively small pitch winding from an inlet to an outlet.
 3. An arrangement according to claim 2, characterized in that a multiple groove means is provided for the guidance of the cooling liquid.
 4. An arrangement according to claim 1, characterized in that said groove means is arranged at the outer surface of the cylinder liner and is delimited externally by the mounting body.
 5. An arrangement according to claim 1, characterized in that the groove means begins at the upper edge of the cylinder liner and winds about the cylinder liner at least over a part of its entire height.
 6. An arrangement according to claim 1, characterized in that said inlet means terminates in said groove means substantially tangentially to the circumference of the cylinder liner.
 7. An arrangement according to claim 6, characterized in that said outlet means terminates in said groove means substantially tangentially to the circumference of the cylinder liner. 